DDR and BDDR selection process...

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Hello everyone.
I am happy to let you all know that I have passed my voucher exam for my CCNA qualification, so I am left now with 4 more weeks to go and sit that final exam and hopefully pass it.
In this voucher exam one of the questions was and I quote "which of the routers will take part in the DDR and BDDR selection process for the London router?" please see pic attached.
I have forgotten it a bit but if memory serves me well the selection process goes by the highest priority set on all ports on every router, or highest IP address from a loopback interface or the highest IP address from a physical interface.
But in the pic provided in the exam there was no IPs mentioned just links, a Frame-Relay link, a PPP link and 2 router connected by a switch.
Any help really appreciated everybody.
Cheers,

 

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there is no need for DR/BDR on PPP links, as there will be only two routers on the link to exchange routing information

 

True... lol...
That's what I was missing. Now that you have mentioned it, I do remember, lol, it has been a while.
Cheers mate.